Thanks for your fast and helpful replies. That helped a lot. I am useing the firmware that came with the printer from factory and haven´t flashed a newer version.
My actual settings are:
Layer height: 0.2 mm
Print speed: 50 mm/s
Printing temperature: 210° C
Retraction speed: 45 mm/s
Retraction distance: 4.5 mm
Travel speed: 175 mm/s ( I also tried 250 mm/s, worked fine, without skipping or offset, but reduced it a little bit again)
You gave me a lot of good starting points. So no stringing is a combination of different matching settings, which are individual for each filament too. Did not know that before. Thanks for the detailed explanation iluminarti.So I will make an Excel sheet with the optimum values I found.
First I will print out that bowden clip. I have one on the hotend side, but none on the extruder side. Second I will try to lower the temperature and print speed to find out the lowest still working configuration and then higher the values a bit. By the way lowering temperature, when I set a lower temp for the print in Cura, it takes this value, heats up the bed up to it, but when it is reached, it changes the target value to 220°C and starts as 220°C is reached. Another bug or any wrong setting from my side? I did not have a problem like this with pronterface on the MendelMax.
As Retraction speed I will use 35 mm/s, as mentioned.
Firmware, any possibility to find out which one I have and where to get the newest? Installation will be done via Arduino IDE, I think.
@gr5: I will read your post just after finishing writing. Looks like a very helpful one. Thanks.
Also I had a quick look at the Esteps post. Have to read it in detail again.
I am not yet sure how much the values differ on each type of filament, but maybe a database of settings would be a good thing for getting people started quick. Of course, when you have the experience you don´t need it anymore and one setting is not optimized for all kinds of prints... Does anything like this exist?
With the fan design, I made good experiences. It has to be well printed, otherwise it will melt because of touching your hotend... So I had to print twice... The first thing I printed was the small Ultimaker Robot, of course. I looked good, but the left side where the cooler is, better than the other. On the right side you could see printed lines on the arms hanging a little bit. I think the reason is that they where in shadow zone caused by the print itself. I also realized this minor error on other prints. There was always a good side, the left where the fan was, and a bad, the right. With the fan duct both sides are printed very good. And you are right iluminarti, I also have the feeling that it reduces airflow, because it is to narrow and the fan to weak, but the airflow is still strong enough for good results. It is better than the original one, but I think there is still space for improvements. Maybe I will do some. I haven´t tried the mentioned fan mount yet. Perhaps I will print one and make a comparison of the two, if anyone interested. Or is this a topic discussed over and over?
Regards,
Philip